* rewrite of DI-Container

* seperation of logic on actions
* added `DuplicateOriginal` to work on resonably sized images

* tested with WP 4.8

* better code documentation

* tested compatibility with WordPress 4.7

* urldecode request uri regarding non-english filename characters

fix non-standard uploads path in wordpress

added trailing backslashes to composer json

* added settings page under "Media"

* provided settings section and fields extensibility for add ons
* added translations
* better use of pimple api (instead of changing variable visibility)

1.2.2

* added `AbstractAddon` class
* changed image resizing from simple `resize` method to `crop`
* tested against WordPress 4.6 beta 3

* provide better version checks for PHP version, WordPress version

* check if image editor present
* better admin notices
* improved auto disabling if checks fail

* introduced `resizefly_resize_path` filter